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J. R. MATHEWSON. MANUFACTURE OF OURVED TUBES FOR JEWELRY.

(NO Model.)

$"Patented Sept. 9. 1890.

Ffg 1- Fng 5 WITNEEEEEI- UNITED STATES PATENT OFFICE.

JAMES R. MATHEWSON, OF IVRENTHAM, MASSACHUSETTS, ASSIGNOR TO EDWARD P. DAVIS AND WILLIAM H. WADE, BOTH OF SAME PLACE.

MANUFACTURE OF CURVED TUBES FOR JEWELRY.

SPECIFICATION forming part of Letters Patent No. 435,939, dated September 9, 1890.

Application filed June 28,1890- Serial No. 357,056- (No model.)

To all whom it may concern.-

Be it known that 1, JAMES R. MATHEWSON, of Wrentham, in the county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in the Manufacture of Curved Tubes for Jewelry, of which the following is a specification.

In the manufacture of jewelry, especially of bracelets, it is frequently the case that one or more curved tubes are employed. These tubes are placed at and form the ends of the bracelets, and are open at their inner and closed at their outer ends, the curvature being substantially in conformity with that of the body of the bracelet. In order that the outer ends of these tubes maybe closedit has heretofore been customary to solder a cap onto one of the ends of the tube. In my invention, however, I provide a curved tube with either a single or compound curve with an integral closed end. This greatly enhances the finish and appearance of the bracelet end, and is a distinct gain in the art of manufacturing jewelry where curved tubes are employed.

The nature of the improvement is fully described below, and illustrated in the accompanying drawings, in which Figure 1 is a view of a bracelet provided at its ends with the integral curved tubes above mentioned. Fig. 2 shows the blank out of which the tube is formed. Fig. 3 is a section of a die by means of which a straight tube is drawn. Fig. 4. shows a die in section with the tube being drawn and at the same time provided with a curvature. Fig. 5 is perspective view of a completed tube provided with a single curve. Figs. 6 and 7 are respectively a plan and elevation of a tube provided with a double or compound curve.

Similar letters of reference indicate like parts.

A represents the body of the bracelet, and B B are the tubes placed at and constituting the ends thereof. Each of these tubes is provided with one or more curves, and has its outer end B closed and integral with the rest of the tube. The inner end B" is open, and

preferably provided with trimming or ornamentation of any desired description.

The manner of constructing the tube is as follows: A blank a, Fig. 2, is out out and is forced through the hole I) in a die 0, Fig. 3, thus producing a straight tube, as shown in said Fig. 3. This is the ordinary process of drawing, and is not new in this invention, a straight tube with an integral end, Fig. 3, having been made before. After the tube has been drawn one or more times, as deemed necessary, in the manner above described, it is again drawn by being forced through the flared hole d in another die e by means of a curved plunger or arbor f,asuitab1e machine being usually employed for the purpose. Thus a curved tube with an integral closed end is produced, the curvature being produced during the process of drawing.

In Fig. 5 the tube has a single curvature produced by the arbor or plunger f, while in Figs. 6 and 7 the tube has two curves produced by an arbor or plunger of correspond-- ing shape.

As above stated, a curved j ewelry-tube with an end soldered on after drawing is not new, and a straight tube drawn with an integral closed end is not new; but it is believed that a curved tube for jewelry with an integral end, said tube being curved during the process of drawing, is new in this invention.

The tube may be round, as in Fig. 5, elliptical, as in Figs. 6 and 7, or of other desired shape.

Having thus fully described my invention, what Iclaim, and desire to secure by Letters Patent, is-

In the manufacture of curved tubes for jewelry, a longitudinally-curved drawn tube, as B, with an integral closed end, as B, the curvature being produced during the process of drawing, substantially as set forth.

JAMES R. MATHEWSON.

Witnesses:

WINTHROP F. BARDEN, FRANK E. WHITING. 

